[MEncoder-users] A good compromise for deinterlacing camcorder-dv-files

[Christian Ebert]

* Grozdan on Sunday, June 27, 2010 at 11:04:15 +0200
> On Sun, Jun 27, 2010 at 10:57 AM, Christian Ebert <blacktrash at gmx.net> wrote:
>> * Grozdan on Sunday, June 27, 2010 at 08:05:29 +0200
>>> On Sun, Jun 27, 2010 at 1:21 AM, Al Bogner
>>> <mencoder at ml093.pinguin.uni.cc> wrote:
>>>> There are so many possibilities to deinterlace a video and most times
>>>> deinterlacing is discussed with ripped dvds.
>>>> 
>>>> Do you have a recommendation for camcorder-videos, captured from tape
>>>> to dv1-format?
>>>> 
>>>> For a first try, I used this. The source ist 720x576 interlaced, 16:9
>>>> PAL
>>>> 
>>>> mencoder "$FILE" -fps "$FPS" -aspect "$DAR" \
>>>> -vf
>>>> yadif=0,softskip,scale=1024:576,eq2=1.15,hqdn3d,unsharp=l:5x5:0.9:c:5x5:0.1
>>>> \
>>>> -sws 9 \
>>>> -ovc lavc -lavcopts vcodec=ffv1 \
>>>> -ofps "$FPS" -nosound \
>>>> -o "$FFV1VIDEOFILE"
>>>> 
>>>> If I use yadif=1 I get slow motion, which I found recommended somewhere.
>>> 
>>> That's because yadif=1 is a bobber which doubles the frame rate, ie it
>>> outputs one frame for each field thus doubling the fps...
>>> If you use a bobber in mencoder, you should specify both -fps and
>>> -ofps that is double of the original frame rate. So if you have 25fps
>>> interlaced content, use yadif=1 with -fps 50 and -ofps 50.
>> 
>> Shouldn't that be -fps 25 -ofps 50 ? At least this worked for
>> me[tm], but perhaps mencoder just worked around my stupidity.
> 
> If it works, use it. -fps 50 and -ofps 50 also works (and is highly
> recommended when using the tfields filter which is very similar to
> what yadif=1 does in the sense that it outputs for each field a frame,
> doubling the fps as yadif=1 does)

Strange. I thought -fps is the input frame rate ...

>>> As Andrew recommended, you could also use the pp=lb (linear blend)
>>> filter but personally I find it blurs too much for my taste so if I
>>> had to use a deint filter from the pp, I'd got for the pp=ci one
>>> (cubic interpolation, gives pretty sharp images after deint)
>> 
>> Have to try that one. However, as _camcorder_ material often has
>> shaky images -- as opposed to industrial preprocessed dvd
>> material -- I often found the need to work around the sharpness
>> which resulted in sharp squares e.g. in areas that are mostly one
>> color but with "gradient" transitions (blue sky).
> 
> There's no deshaker filter yet in mplayer so I can't help on that and
> I don't deal with shaky stuff at all

You can actually observe it with sports, or right now at the
world cup: when there is a fast pan shot the picture on HD tv is
full of (sharp) little squares -- doesn't happen on old fashioned
interlaced tv.

c
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